Tutu, a Nobel peace prize winner, said in a statement Sunday that Museveni a month ago had pledged not to allow the anti-gay legislation to become law in Uganda. But last week Museveni said he had reconsidered and would consult scientists on whether homosexuality is determined by genetics or by a person’s choice.

Tutu said he is “disheartened” by Museveni’s change because there is “no scientific basis or genetic rationale for love … There is no scientific justification for prejudice and discrimination, ever.”